Negative Mass Cosmology: A Toy Model

The success of the standard cosmological model depends on ingredients such as inflation in the early universe, the existence of dark matter and a positive cosmological constant. None of these have been justified based on established physics. Recently, alternative cosmological models have emerged that obviate these assumptions but in which negative mass particles are introduced (as in Bondi or Dirac-Milne models). To shed light on the underlying dynamics of one of these cosmologies, here we consider the evolution of a two-component system consisting of ordinary matter and Bondi particles, i.e. negative mass particles that are characterized by negative inertial, active and passive mass and hence obey the equivalence principle. In this preliminary work we will investigate Newtonian simulations of gravitationally neutral one-dimensional systems of particles. Among other interesting features, we will demonstrate the existence of two different expansion regimes perhaps separated by the present epoch, and the development of clusters of ordinary matter, i.e. “one-dimensional galaxies”.